135666691237 has 8 divisors (see below), whose sum is σ = 169142887872. Its totient is φ = 105714304800.

The previous prime is 135666691219. The next prime is 135666691261. The reversal of 135666691237 is 732196666531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135666691237 - 2²³ = 135658302629 is a prime.

It is a super-2 number, since 2×135666691237² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135666691037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880952464 + ... + 880952617.

It is an arithmetic number, because the mean of its divisors is an integer number (21142860984).

Almost surely, 2^135666691237 is an apocalyptic number.

It is an amenable number.

135666691237 is a deficient number, since it is larger than the sum of its proper divisors (33476196635).

135666691237 is a wasteful number, since it uses less digits than its factorization.

135666691237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761905099.

The product of its digits is 7348320, while the sum is 55.

The spelling of 135666691237 in words is "one hundred thirty-five billion, six hundred sixty-six million, six hundred ninety-one thousand, two hundred thirty-seven".